Windows 10 suddenly taskbar bordered black and white?

Je
1

When I was visiting my grandma today, her laptop was suddenly strange. Your taskbar is not working and everything looks different. Does anyone know what that is or how you can change it again? See pictures

Windows 10 suddenly taskbar bordered black and white Windows 10 suddenly taskbar bordered black and white - 1
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Looks like high contrast design.

You can change the display adjustment again.

Windows 10 suddenly taskbar bordered black and white